Figure 1: Effect of HAOP and MOP extracts of Operculina turpethum on total acidity and free acidity in aspirin + PL induced ulcers. Values are expressed as mean SEM of 6 animals. Comparisons were made between (a) Group I versus II, III, IV, V, VI and VII, (b) Group II versus III, IV, V, VI, and VII, and (c) Group III versus V and VII. Symbols represent statistical significance: , , and .